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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.net.*;
  4.  
  5. class Main
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9.  
  10.     InetAddress from = InetAddress.getByName("1.2.3.4");
  11.     InetAddress to = InetAddress.getByName("1.2.5.6");
  12.     byte[] partsTo = to.getAddress();
  13.     for (;;) {
  14.         System.out.print(from+" - ");
  15.         byte[] parts = from.getAddress();
  16.         boolean sameUpperPart = true;
  17.         for (int i = 0 ; sameUpperPart && i < parts.length-1 ; i++) {
  18.             sameUpperPart &= (partsTo[i] == parts[i]);
  19.         }
  20.         if (sameUpperPart) {
  21.              System.out.println(to);
  22.              break;
  23.         }
  24.         int last = parts.length-1;
  25.         parts[last] = (byte)0xFF;
  26.         System.out.println(InetAddress.getByAddress(parts));
  27.         parts[last] = 0x00;
  28.         for (int i = last-1 ; i >= 0 ; i--) {
  29.             if (++parts[i] != 0) {
  30.                 break;
  31.             }
  32.         }
  33.         from = InetAddress.getByAddress(parts);
  34.     }
  35.  
  36.  
  37. 	}
  38. }
Success #stdin #stdout 0.03s 245696KB
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stdin
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Standard input is empty
stdout
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/1.2.3.4 - /1.2.3.255
/1.2.4.0 - /1.2.4.255
/1.2.5.0 - /1.2.5.6
https://ideone.com/kxNmh
language:
Java (HotSpot 12)
created:
13 years ago
visibility:
public

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